2101265620 has 24 divisors (see below), whose sum is σ = 4672226664. Its totient is φ = 791064576.

The previous prime is 2101265609. The next prime is 2101265629. The reversal of 2101265620 is 265621012.

It can be written as a sum of positive squares in 4 ways, for example, as 845413776 + 1255851844 = 29076^2 + 35438^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101265629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3089757 + ... + 3090436.

It is an arithmetic number, because the mean of its divisors is an integer number (194676111).

Almost surely, 2^2101265620 is an apocalyptic number.

2101265620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2101265620 is an abundant number, since it is smaller than the sum of its proper divisors (2570961044).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2101265620 is a wasteful number, since it uses less digits than its factorization.

2101265620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6180219 (or 6180217 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 2101265620 is about 45839.5639159013. The cubic root of 2101265620 is about 1280.8363715146.

Adding to 2101265620 its reverse (265621012), we get a palindrome (2366886632).

The spelling of 2101265620 in words is "two billion, one hundred one million, two hundred sixty-five thousand, six hundred twenty".